package com.turbo.cloud.core.config.jackson;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

/**
 * 〈返回json空值去掉null和""〉 〈功能详细描述〉
 *
 * @author zhangluning
 */
@Configuration
public class JacksonConfig {
    @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        /*
         * 1、通过该方法对mapper对象进行设置，所有序列化的对象都将按改规则进行系列化
         * 2、Include.Include.ALWAYS 默认
         * 3、Include.NON_DEFAULT 属性为默认值不序列化
         * 4、Include.NON_EMPTY 属性为 空（""） 或者为 NULL 都不序列化，则返回的json是没有这个字段的。这样对移动端会更省流量
         * 5、Include.NON_NULL 属性为NULL 不序列化,就是为null的字段不参加序列化
         **/
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

        return objectMapper;
    }
}
